[Toby]

Ron,

When we first pulled the valve cover and started checking the valve was stuck slightly open or slightly depressed and could not be moved. Builder says it could hve been water in cylinder that bent rod and disintegrated piston, but cannot figure where the water came from (before holes) as gaskets were all good and sealed. if walls had cracked first water would have been pushed out cracks, thus no overpressure to cause this.